<template>

    <el-container class="home-container">

        <!-- 头部区域 -->
        <el-header>
            <div class="header-title">
                <img src="../assets/logo.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出登录</el-button>
        </el-header>

        <!-- 页面主体区域 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ? '64px' : '200px'">

                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!-- 侧边栏菜单区域 collapse表示是否折叠菜单 -->
                <el-menu background-color="#333744" text-color="#fff" active-text-color="#409BFF" :collapse="isCollapse"
                    :collapse-transition="false" router :default-active="activePath">

                    <!-- 这是一级菜单 -->
                    <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
                        <!-- 一级菜单模版区 -->
                        <template slot="title">
                            <!-- 图标 -->
                            <i class="el-icon-location"></i>
                            <!-- 文本 -->
                            <span>{{ item.authName }}</span>
                        </template>

                        <!-- 二级菜单 -->
                        <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id"
                            @click="saveNavState('/' + subItem.path)">

                            <!-- 一级菜单模版区 -->
                            <template slot="title">
                                <!-- 图标 -->
                                <i class="el-icon-menu"></i>
                                <!-- 文本 -->
                                <span>{{ subItem.authName }}</span>
                            </template>

                        </el-menu-item>
                    </el-submenu>

                </el-menu>



            </el-aside>
            <!-- 主布局 -->
            <!-- 路由占位符 -->
            <el-main>

                <router-view></router-view>

            </el-main>
        </el-container>
    </el-container>

</template>

<script>

export default {

    data() {

        return {

            //左侧菜单数据
            menulist: [],
            //是否折叠
            isCollapse: false ,// 初始值根据需求设定
            //被激化的链接地址
            activePath:''




        }


    },

    created() {

        this.getMenuList()
        this.activePath=window.sessionStorage.getItem('activePath')
        if(this.activePath==null){

            this.activePath="/users"

        }

    },

    methods: {


        logout() {

            window.sessionStorage.clear();
            this.$router.push("/MyLogin");


        },

        //这是获取所有的菜单
        async getMenuList() {

            const { data: res } = await this.$http.get('menus')

            console.log("这个是什么：" + res.data)

            if (res.meta.status !== 200) return this.$message.error(res.meta.msg)

            this.menulist = res.data

        },

        //点击按钮切换菜单的折叠和展开
        toggleCollapse() {

            this.isCollapse = !this.isCollapse


        },
        //保存链接的激化状态
        saveNavState(activePath) {
        //menu自带的select能动态获取被选中的path，
        // 再赋值给default-active就可以了
          window.sessionStorage.setItem('activePath',activePath)
            //每次点击列表都要重新去存值
          this.activePath=activePath

        },

    }


}

</script>

<style scoped>
.home-container {

    height: 100%;

}

.el-header {

    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    /* 左右贴边对齐 */
    padding: 0;
    /*贴边对齐 */
    align-items: center;
    color: #fff;
    font-size: 20px;

}

.header-title {
    display: flex;
    align-items: center;

    img {

        width: 50px;

        height: 50px;

    }

    span {

        margin-left: 15px;

    }

}

.el-aside {


    background-color: #333744;

    .el-menu {

        border-right: none;


    }


}

.el-main {

    background-color: #eaedf1;

}

.toggle-button {

    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
}
</style>